Improvement in compressed-air holders for the engines of street-cars



'J. GRI SCO'M. COMP-RESSED'AIR HOLDERS FOR THE ENGINES ow-s'r-REET CARS;

N mnmoo.

N.PETER8. PHOTD-LITHOGRAFNER, WASHINGTON. D C,

4 'NITED TATES PATENT- OFFICE.

JOHN GRISOOM, OF NEW YORK, N. Y.

Specification. forming part of Letters Patent No. 179,300, dated J une27, 1876 application filed December 6, 1875.

To all whom it may concern: Y

Be it known that I, JoHN GRIsGOM, of the city and State of New York,have invented an Improvement in Holders for Compressed Airor Gases forEngines or for other purposes, of which'the following is a specificationGreat difficulty has heretofore been-experienced in obtaining a holderadapted to streetrailway cars for containing compressed air to operatethe propelling-engine. Metal tanks are heavy and liable to leak, besideswhich the pressure upon the flat or nearly flat heads is liable to causea separation of the head from the metal of the cylinder.

My invention is for lessening the Weight of the air-holders, and forsustaining the heads independent of the cylinder, so that there' willnot be any strain at the joints between the heads and cylinder inconsequence of pressure upon the heads.

In the drawing, Figure 1 is a longitudinal section of the air-holdercomplete, and Fig. 2 is a cross-section at' the line or or.

The cylinder a is made of paper, rolled upon a core, and the respectivethicknesses secured together by adhesive material, such as glue. Careshould he vtaken to roll the paper so that the greatest strength will becircumterentially of-the cylinder.

The core upon which the cylinder at is made should be in sections like ahat-block, so that it can be removed with facility after the cylinderhas been completed and thoroughly dry. The outside and inside surfacesof this cylinder are preferaby coated with water-proof material, such aspaint or varnish, and the ends are dressed oft true and of a shape tosuit the metallic or paper heads. There is a metal band, 0, slightlytapering, driven into each end of the cylinder, to sustain the paperagainst the pressure of packing material introduced between the flange dof the head f and the said cylinder a, and suitable washers are bypreference introduced between the ends of the cylinder and the surfacesof the heads.

The heads f are connected together by the tie-bolts g, and these aremore or less numerous, according to the size of the cylinder and thepressure to be sustained. Itis preferable to screw these tie-rods intohollow sockets t in one head, so that there will not be any hole throughsaid head, and the other ends of the tie-rods that pass through theother head f are provided with nuts l, which are notof the ordinarycharacter, but are hollow, capshaped, so that air passing throughbetween the screw and nut cannot escape, and there is only one flat faceto each nut, that is rendered perfectly tight by any suitable washer, orby red lead or similar material. These tie-bolts serve to hold the headstogether under the pressure to which they are subjected without anystrain coming upon the cylinder from the pressure upon the heads.

The central'tie-rod is preferably made with an ordinary nut, 0, thatcomes within the cavity of the coupling or flange r of the connection 8for the air-pipe, so that there will not be leakage at this nut, andaround this tiebolt and nut are the openings t, that allow theatmosphere, under pressure or otherwise, to pass freely into or out ofthe holder.

The heads of the cylinder may be of metal or of paper pressed into asuitable mold, the layers of paper being cemented together, and thedirection of the fiber in one sheet crossing those of the adjacentsheets.

1 claim as my invention 1. The holder for compressed air or gas,constructed of a cylinder of paper with heads connected together bytiebolts with capshaped nuts, substantially as set .forth.

2. The combination, with the paper cylinder and heads, constructed asspecified, of the tiebolt passing from one head to the other, and thecoupling-flange r, inclosing the nut of the tie-bolt, as set forth.

Signed by me this 3d day of December, A. D. 1875.

JOHN GRISOOM.

Witnesses: I

GEO. T. PINOKNEY, GHAs. H. SMITH.

